.yuan {
    width: 450px;
    height: 450px;
    border-radius: 50%;
    overflow: hidden;
    position: relative;
}

.yuan_1 {
    width: 100%;
    height: 100%;
    display: flex;
    flex-wrap: wrap;
}

.yuan1 {
    width: 49.5%;
    margin-right: 1%;
    margin-bottom: 1%;
    background-size: auto;
    background-repeat: no-repeat;
    cursor: pointer;
}

.yuan_2 {
    margin: 0 auto;
    width: 85%;
    height: 85%;
    display: flex;
    flex-wrap: wrap;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    /* border: 1px solid; */
    border-radius: 50%;
    overflow: hidden;
}

.yuan_1 .yuan1,
.noshow_this_y {
    opacity: 0;
    transition: .4s;
}

.show_this_y {
    opacity: 1 !important;
    /*background-color: transparent !important;*/
    position: relative;
    z-index: 5;
    transition: .4s;
}

.yuan_1 .yuan1:nth-child(1) {
    height: 49.5%;
    /*background-image: url(../images/join/j1_1.png);*/
}

.yuan_1 .yuan1:nth-child(2) {
    /*background-image: url(../images/join/j1_2.png);*/
}

.yuan_1 .yuan1:nth-child(3) {
    height: 49.5%;
    /*background-image: url(../images/join/j1_3.png);*/
}

.yuan_1 .yuan1:nth-child(4) {
    /*background-image: url(../images/join/j1_1.png);*/
}

.yuan1:nth-child(1) {
    background-color: #2E3097;
}

.yuan1:nth-child(2) {
    background-color: #6929A3;
}

.yuan1:nth-child(3) {
    background-color: #2B50AD;
    margin-bottom: 0;
}

.yuan1:nth-child(4) {
    background-color: #4D2BAD;
    margin-bottom: 0;
}

.yuan1:nth-child(2n) {
    margin-right: 0;
}

.yuan_3 {
    position: absolute;
    width: 53%;
    height: 53%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    z-index: 8;
    border-radius: 50%;
    text-align: center;
    line-height: 53%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 34px;
    font-family: Microsoft YaHei-Bold, Microsoft YaHei;
    font-weight: bold;
}

.yuan_3 p {
    padding: 30px 0;
    margin-bottom: 0px;
    cursor: pointer;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-image: -webkit-linear-gradient(226deg, #9538EA 0%, #2E3097 100%);
}